低幅度构造油藏富集主控因素及成藏模式
——以红河油田延安组油藏为例

Main oil enrichment controlling factors and accumulation model for low amplitude structure reservoir:A case of Yan′an reservoir in Honghe Oilfield

 许艳争 杜箫笙 毕明柱 高辉

 中国石化华北分公司勘探开发研究院，河南 郑州 450006

 Research Institute of Exploration and Development, Huabei Company, SINOPEC, Zhengzhou 450006, China

 为明确红河油田延安组低幅度构造油藏富集主控因素及成藏模式，在对油气藏类型及分布规律研究的基础上，采用油气分布与成藏条件叠合分析方法，对延安组成藏、主控因素及模式进行了研究。结果表明，红河油田延安组油气主要分布在差异压实作用形成的低幅度构造中。其成藏及主控因素为：有效烃源岩是油气富集的基础；分流河道砂体为油气聚集优质储层；油源断层组成优势输导通道；低幅度构造是油气富集的必要条件；有油源断层沟通发育的圈闭组成富集部位。最终根据断层沟通的圈闭类型建立了2种成藏模式：断层断开有效背斜圈闭，直接沟通储层及有效圈闭，富集成藏，或断层沟通储层边部，油气在浮力作用下向高处运移成藏；断层断开鼻隆圈闭，断层断开位置不在有效圈闭内，断层沟通储层边部，油气在浮力作用下向高处运移成藏。

 In order to determine the main oil enrichment controlling factors and accumulation model for low amplitude structure reservoir in Honghe Oilfield, based on the study of reservior types and distribution law, this paper studied the main controlling factors and models for oil and gas accumulation and distribution of Yan′an oil layer in Honghe Oilfield. The result shows that oil and gas of Yan′an oil layer mainly distribute in low amplitude structure of Honghe Oilfield. The oil and gas accumulation and distribution of Yan′an oil layer in Honghe Oilfield is controlled by the following five factors: effective source rock is the base of reservoir formation; distributary channel sand body is the oil accumulation premium reservoirs; oil source faults are composed of advantage translocation channels; low amplitude structure is the necessary condition; fault system becomes the main part of oil enrichment. There are two oil and gas accumulation models in Honghe Oilfield: one is oil and gas migrate through faults or sand body and accumulate in high position of anticline structure, the other one is oil and gas migrate through faults and sand body and accumulate in high position of nose uplift structure.

10.6056/dkyqt201505003